1 files changed, 4 insertions, 0 deletions
diff --git a/proc.c b/proc.c
index 59de71dd61..abf26a68bb 100644
--- a/proc.c
+++ b/proc.c
@@ -277,6 +277,10 @@ proc_new(VALUE klass, int is_lambda)
 	}
     }
 
+    if (block->proc) {
+	return block->proc;
+    }
+
     procval = vm_make_proc(th, cfp, block);
 
     if (is_lambda) {